My Williams geep makes the strangest sounds sometimes. It likes to beep like a cell phone at odd times, and there seems to be an ambient sound eminating from it, sort of like a low hissing. The horn and bell work fine.

I have a Williams Berkshire, and I can't figure out how to take it apart!
I'm suppose to re-lube the darn thing, but getting inside it to d othat is a mystery to me. I've dis-assembled and re-assembled all sorts of Lionel locomotives, but this one has me stumped.
Does anyone have any suggestions?